Pike crab production regional distribution
Pike crab is one of China's important export best-selling products, it is mainly exported to Japan, Hong Kong, Macao and other countries and regions. The production area is mainly distributed in Liaoning, Hebei, Tianjin, Shandong, Jiangsu, Zhejiang, Fujian and other sea areas, generally from south to north, March to May and September to October, the production season is higher, April to May, Bohai Bay Liaodong Peninsula's production is higher. Japan, Korea, the Malay Archipelago, the Red Sea is also distributed.
The environment of the pike crab's origin
1, water temperature: pike crab adapts to the water temperature of 8 to 31 ℃, the optimal growth of the water temperature of 15.5 to 26.0 ℃. In different water temperature environment, the pike crab's activity is different. When the water temperature is ~1.5°C, do not eat any food, some crabs freeze in shallow water, at 0 to 6°C, do not eat, stay up to sneak, in a state of rest. At 8 to 10°C, feeding stops, activity is weak, and they lurk in deep water. At 14°C, food intake decreases and begins to move to deeper areas with normal activity. At 15 to 26°C, food intake is high, activity is normal, and growth is rapid. At 17 to 21°C, the peak of crossings. At 14 to 21°C, egg-holding groups were found. At 12 to 14°C, spawning begins.
2, salinity: the salinity of the pike is 13 to 38, the best growth salinity is 20 to 35, and the overwintering adaptive salinity is 28-35. salinity lower than 8 or higher than 38, stop feeding and activity, and all die after one day.
3, other: the pike's adapted pH value of 7.5-8, dissolved oxygen is not less than 2mg/L, chemical oxygen consumption is generally less than 12mg/L, hydrogen sulfide is not more than 0.2mg/liter. The LC50 for copper ions is 58 mg/L over 24 hours.
Common pike crab species
1, three warts pike crab: three warts pike crab, commonly known as pike crab, white crab, etc., belongs to the crustacean, is a family of pike crab, is an important economic crab along the coast of China. It has developed rapidly and is lucrative. It has become an important breeding species along the coast of China. It usually lives and breeds at a depth of 3 to 5 meters. It migrates to depths of 10 to 30 meters in winter and prefers to dig holes in the bottom of sediments. The suitable salinity is 16-35, the water temperature is 4-34°C, the pH is between 7-9, the optimum salinity is between 26-32, and the optimum temperature is 22-28°C.
2. Red Star Pike: The cephalothorax of the red star pike is pike shaped and slightly elevated, with three prominent braided bumps on the surface, well-developed chelicerae, long prismatic, with obtuse teeth at the inner edge, and the fourth pair of stepped joints it is flat and broad like a paddle for swimming. This is a warm-water bottom crab. Distributed in Japan, Hawaii, the Philippines, Australia, New Zealand, the Malay Archipelago, the Indian Ocean up to the coast of South Africa throughout the Indo-Pacific warm-water area, Taiwan Island and mainland China in Guangxi, Guangdong, Fujian, etc., the living environment is seawater, most often found in the sandy seabed at a depth of 10 to 30 meters.
3, distant sea pike crab: distant sea pike crab for the pike family pike crab genus of animals, distributed in Japan, Tahiti, the Philippines, Australia, Thailand, the Malay Archipelago, East Africa, Taiwan Island and mainland China, Guangxi, Guangdong, Fujian, Zhejiang and other habitats are seawater, usually live in the seabed depth of 10 to 30 meters in the muddy or sandy seabed. The crab is about 20 centimeters wide, males in addition to the movable and immovable fingers in the chelicerae and the anterior joints of the feet, knuckles of the dark blue, the rest of the parts are mostly bluish-green and covered with light blue or white mottled.